摘要
The Dafuzu rock mass is located at the junction of Jiangxi province and Fujian province,and is closely related to uranium mineralization.In this paper,based on field surveys, the authors investigate the rock forming time of medium-coarse porphyritic biotite monzonitic granite and fine-grained biotite granite. Combining previous studies,Dafuzu granite rich in Al-rich minerals such as biotite and muscovite and characterized by relatively low SiO2 and high Al2O3,peraluminous (ACNK=1.12～1.36), suggest that the Dafuzu granite was probably formed in the syn-orogenic tectonic setting and may be derived from sedimentary rocks consisting of ancient crustal materials.In addition,the Dafuzu rock mass is characterized as having a high U and Th content with a leaching rate of mobile uranium and independent of micro-grained uraninites,suggesting a great uranium metallogenetic potential.
